Measurement of the Solar Gravitational Deflection of Radio Waves using Geodetic Very-Long-Baseline Interferometry Data, 1979–1999
Steven S. ShapiroDepartment of Physics, Guilford College, Greensboro, North Carolina 27410, USA. [email protected]J. L. DavisHarvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USAD. E. LebachHarvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USAJ. S. GregoryDepartment of Physics, Guilford College, Greensboro, North Carolina 27410, USA
2004en
ABI
Annotatsiya
We used very-long-baseline interferometry (VLBI) to measure the deflection by the Sun of radio waves emanating from distant compact radio sources. This bending is characterized in the parametrized post-Newtonian formalism by gamma, which is unity in general relativity. Using a large geodetic VLBI data set, we obtained gamma=0.9998(3)+/-0.0004(5) (estimated standard error). We found no systematic biases from our analysis of subgroups of data.
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